The last update that I have been able to install is 18875. I get an error message saying that my computer is not yet ready for Windows 10 and I must wait for it to become ready. I have read on some other forums that if you have a USB hard drive installed that this can prevent the update from installing. I have disconnected all of the USB drives as well as anything else that is connected via USB except for my keyboard and mouse. I have now received this error on 18800 and now I am getting the same message when trying to upgrade to 18890. Does anyone know of a workaround to get past this?